Marshalls Drivesett Argent Priora is a patented Permeable Block Paving. It looks?and feels just like the contemporary Drivesett Argent, but acts as sustainable drainage system. The patented Priora Driveway System works by draining water away via the voids created by the engineered, interlocking nibs surrounding the block. The granite aggregate adds a subtle sparkle to the product surface